DIGITAL DATABASE FOR THE HUDSON RIVER QUADRANGLE NK-18, UNITED STATES AND CANADA, OF THE QUATERNARY GEOLOGIC MAP OF THE UNITED STATES (MISCELLANEOUS INVESTIGATIONS SERIES I-1420) Files available through this site represent the digital component of the Hudson River Quadrangle of the Quaternary Geologic Atlas of the U.S., Miscellaneous Investigations Series, Map I-1420 (NK-18). The files consist of .e00 files, shapefiles, and pdf files of the map's illustrations and correlation diagram, and .pdf files of the map unit descriptions and sources of information. An ARC/INFO aml, keyfiles, shadeset, lineset, and markerset are included to produce the plot of the data. The following ARC/INFO export coverages are included in hud_rivGIS.zip: >geo_net--map unit polygons and open water; lines that are geologic contacts and shorelines. >gla_lin--a line coverage indicating the outer limits of glacial advance or major stillstand of ice, eskers, crest of submerged end moraine, erratic train or dispersal fan, and glacial lake spillway or meltwater channel >gla_pnt--a point coverage indicating wind direction indicated by dune orientations, direction of ice movement, and ice-molded landforms >hydr_lin--a line coverage indicating locations of streams and water bodies >topo_lin--a line coverage containing contour lines >bnd_lin--a line coverage with a neatline and state and international boundary lines >bnd_net--a polygon coverage containing county and administrative areas >rd_lin--a line coverage of state and federal highways >rr_lin--a line coverage of railroads >grid_lin--a line coverage of 1 degree projection lines Also included in hud_rivIMG.zip are: I-1420_nk-18_map.pdf--A scan of the original published paper map I-1420_nk-18_plotfile.pdf--A plot of the digital files containing map units, linear and point glacial features, hydrology, topography and list of map symbols optimized for printing hudson.met--an ASCII file of FGDC formal metadata I-1420_nk-18_correlation.pdf--A scan of the chart showing correlation of map units I-1420_nk-18_index.pdf--An index map showing location of Quaternary Geologic Atlas of the U.S. quadrangles I-1420_nk-18_responsibility.pdf--A scan of the illustration of state compilation responsibilities shown on the paper map I-1420_nk-18_textonly.pdf--Text description of map units, figure captions, and sources of information used in preparing the original map Also available in the file hud_rivAV.zip are the ArcView shapefiles of the Arc/Info coverages Charles A. Bush U.S. Geological Survey (303) 236-4723 cbush@usgs.gov